Skiving machines



Nov. 15, 1955 F. c. CHOICE SKIVING MACHINES 3 Sheets-Sheet 1 Filed March 16, 1955 [nvcnfor Frank Co/eman C/zaz'ce 5/ hid/4270i" w Nov. 15, 1955 F. c. CHOICE SKIVING MACHINES 5 Sheets-Sheet 2 Filed March 16, 1955 W fnvemar Fran/r Coleman Choice United States Patent SKIVING MACHINES Frank Coleman Choice, Leicester, England, assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application March 16, 1955, Serial No. 494,757 Claims priority, application Great Britain April 9, 1954 17 Claims. (Cl. 69-16) This invention relates to skiving machines, and is illustrated herein as embodied in a machine of the type disclosed in United States Letters Patent No. 1,944,311, granted January 23, 1934, upon an application of R. B. Woodcock et al.

As in the operation of the above-mentioned prior machine, the skiving cut produced by the illustrative machine is controlled by a guide or presser which is mounted to swing upon a carrier in order that the angular relation of the presser to the knife may be varied according to. the desired angle of the skiving cut to be made upon the work; and the carrier, as before, is mounted for movement toward and away from the knife to vary the depth of the skiving out. g

It is one object of the invention to provide a simple and efifective mechanism by which the presser, in a machine of the type referred to above, can be readily shifted between different operative positions and also can be adjusted to produce a skiving cut of any desired angle and depth in either of these positions, so that a work piece having portions which are required to be skived at different angles or to different thicknesses, or both, may be operated upon with only one continuous handling of the work piece.

To this end, and in accordance with one feature of the invention, there is provided in the illustrative machine improved mechanism for positioning the presser comprising a pair of abutments one of which is adjustable to vary each of the angular positions of the presser, another pair of abutments one of which is adjustable to vary each of the operative positions of the carrier, and connections between the abutments and the presser comprising a stop member carrying all the abutments and mounted for movement between one setting in which one abutment of both sets is utilized to determine one operative position of the presser, and another setting in which the other abutments are utilized to determine the other operative position of the presser.

The presser in the above-mentioned prior machine is normally disposed in one operative position but is moved to and held in its other operative position by operating a treadle mechanism against the action of a spring. Accordingly, throughout any period in which the presser is to occupy its second operative position the operator must continuously exert enough pressure upon the treadle to insure that the presser will be maintained in the desired position.

In view of the foregoing, it is a further object of the invention to provide mechanism, in a machine of this type, for positioning the presser in either of two operative positions which mechanism relieves the operator of the exertion which has been required heretofore in holding the presser in one of its operative positions, as well as the attention which has been necessary to insure that each shifting movement of the presser between its operative positions is complete.

To this end, the Present machine includes, in accordance with a further feature of the invention, improved mechanism for shiftingthe above-mentioned stop member between its predetermined settings, this mechanism comprising with operator controlled means for moving the stopmember out of each setting, additional means acting upon the stop member to complete its movement into its succeeding setting and to hold it therein. The above-mentioned operator controlled means, as embodied in the present machine, includes a treadle operated mechanism which requires only a momentary depression of the treadle since the completion of each shifting movement of the stop member is elfected by the shifting mechanism itself. This construction also permits the immediate release of the treadle, as soon as a shift of the stop member has been completed, without moving the presser away from its newly established position in which the presser is held until the treadle is again depressed.

These and other features of the invention will now be described in detail in connection with the accompanying drawings and will be pointed out in the claims.

In the drawings,

Fig. l is a front elevation, partly in section, of an illustrative machine embodying the invention;

Fig. 2 is a perspective View of certain parts, shown in Fig. l, in exploded relation;

Fig. 3 is a rear elevation of the presser and its mounting;

Fig. 4 is an elevation of a part of the mechanism for shifting and positioning the presser, as viewed from the right;

Fig. 5 is a sectional front elevation of the structure illustrated in Fig. 4, the section being taken along the line VV;

Fig. 6 is a sectional view similar to Fig. 5 but illustrating a different setting of the mechanism shown; and

Fig. 7 is a sectional elevation of the structure shown in Fig. 5, the section being taken along the line VIIVIjI.

The illustrative machine has a presser 1 (Fig. 1), a feed roll 3 and knife 5 which are arranged in the same relation these parts have in the above-mentioned Woodcock et a1. machine. The presser 1 and its supporting and adjusting mechanism are, in the illustrative machine, carried by a box-like frame 7 which is bolted to the right-hand portion of the front wall of the machine frame 9 and takes the place of the swing frame 67 referred to in the Woodcock et a1. patent.

The presser 1 is pivoted on a rounded lip 11 (Fig. 3) of a carrier 13 having a downwardly extending cylindrical stem 15 which is mounted in a bearing 17 in the frame 7 so that the carrier and presser may be moved bodily downwardly or upwardly toward or away from the knife 5 to vary the depth of cut and the thickness of the edge of the skived portion of a work piece being operated upon by the machine. The carrier 13 is obliquely disposed at an angle of about 25 to the vertical as viewed in Fig. 1 or Fig. 3. The stem 15 is bored axially to receive a spring 19 (Fig. 1) which by abutting at its lower end a plug 21 fixed in the lower end portion of the bearing 17 thrusts the carrier 13 upwardly. A block 22, fixed to the carrier by a screw 23, has formed on its lower end portion a tooth 25 which meshes with teeth 27 formed on one arm of a bell crank lever 29 which is freely mounted on a forward end portion of a stud 31 gripped in a hole in the frame 7 by a draw-bolt 33 and nut 35. The upper end portion of the draw-bolt projects upwardly from the frame 7 and is slidably received in a hole provided in the carrier 13 to prevent the carrier from rotating in the bearing 17. The second arm of the bell crank lever 29 extends downwardly and has threaded in the end portion thereof an adjustable abutment screw 37 locked in position by a lock nut 39. The screw 37 abuts against the 3 left end of a horizontally disposed thrust rod 41 slidably mounted in a bearing provided in the frame 7. The right end of the thrust rod 41 has formed thereon a vertically disposed crosshead 43 which engages either of a pair of abutment rolls 45, 47 as hereinafter explained.

The rolls are freely mounted on pins 49, 51 fixed respectively in adjusting bars 53, 55 which are arranged to slide, on adjustment, in guideways 57, 59 formed in a stop member 61 which is pivoted on a pin 63 (Figs. and 6) fixed in a support 65 and is movable between two settings, each corresponding to an operative position of the presser 1. The settings of the stop member are determined by the engagement of either one of two shoulders 66 on the stop member with the right end of the frame 7. The guideways 57, 59 (Figs. 1 and 2) intersect on the axis of the pin 63 and the adjusting bars 53, 55 have portions cut way to allow them to cross each other in their respective guideways. The adjusting bars 53, 55 have stems 67, 69 which are received in threaded sleeves 71, 73 and are prevented from endwise movement therein by shoulders on the adjusting bars which engage the inner ends of the sleeves and friction washers 75, 77 and collars 79, 81 pinned on the outer end portions of the stems. By turning knobs on the outer ends of the threaded sleeves 71, 73 the adjusting bars 53, 55 may be moved to cause the rolls 45, 47 to occupy different positions in the stop member 61. As the thrust rod 41 is always urged towards the right by the spring 19, the crosshead 43 is kept in contact with the roll carried by the adjusting bar which is horizontal, according to the position of the stop member 61. Thus, if one of the sleeves 71, 73 is in a different position of adjustment from the other, as shown in Fig. 1, the presser is moved bodily heightwise by moving the stop member from one position to the other, since the height of the presser is determined by that roll which is in contact with the crosshead 43.

For the purpose of angularly adjusting the pressure 1, it has a depending segment-shaped arm 83 (Fig. 3) which at its lower end is received in an arcuate guideway 85 formed in the carrier 13. An opening 87 is provided in the arm 83 to accommodate an upwardly extending arm of a lever 89 which is pivotally connected to one end of a link 91, the other end of the link being pivotally connected to the arm 83. The two-armed lever 89 is freely mounted on the rear end portion of the aforementioned stud 31. The other arm of the lever 89 extends downwardly and has threaded in its end portion an adjustable abutment screw 93 locked in position by a lock nut 95. A spring-biased lever 94 is pivoted on the carrier 13 and carries at its upper end a freely mounted roll 96 which presses against the segment-shaped arm 83 and causes the screw 93 to be urged against the left end (as seen from the front of the machine, i. e. the right end as seen in Fig. 3) of a thrust rod 97, similar to the thrust rod 41 aforementioned. The rod 97 is operated through rolls 99, 101, adjusting bars 103, 105 and threaded sleeves 107, 109 housed in the stop member and similar to the abovementioned rolls 45, 47, adjusting bars 53, 55 and threaded sleeves 71, 73. By this means, if one of the sleeves 107, 109 is in a different position of adjustment from the other, the presser is moved from one angular position to another by moving the stop member 61 from one setting to the other, since the angular position of the presser will depend upon which of the rolls 99, 101 is in contact with the crosshead of the thrust rod 97. It will therefore be understood that by moving the stop member from one setting to the other, (a) if the rolls 99, 101 are adjusted identically while the rolls 45, 47 are adjusted differently from each other, the presser will be moved bodily heighwise only, with no change in angular position; (b) if the rolls 45, 47 are adjusted identically while the rolls 99, 101 are adjusted differently from each other, the presser will be moved angularly only, with no heightwise bodily movement; and (c) if the rolls 45, 47 are adjusted differently from each other and the rolls 99, 101 are also adjusted differently from each other, then the presser will be moved both angularly and bodily heightwise.

To cause the stop member 61 to snap over from one position to the other, so that it is not delayed in a mid position, a tumbler device comprising a spring-loaded toggle is provided. One toggle comprises, with the stop member, a rod 111 having formed on an upper end thereof a bifurcated head 113 (Figs. 4, 5 and 6) which is pivoted upon a pin 115 carried by the stop member 61. The head 113 is located between two ribs 117 formed on the member 61 and is free to swivel about the pin 115. The lower end portion of the rod 111 is slidably received in a bore in a trunnion block 119 and a spring 121 surrounding the rod is in compression between the head 113 and an upper face of the trunnion block 119. For-wardly and rear-wardly extending cylindrical projections formed on the trunnion block are received in slots provided in an upwardly extending bifurcated arm of a two-armed lever 123 which arm, with the rod 111, constitutes another toggle, the lever being arranged to pivot on a pin 125 carried by the frame 7. A stud 127 having a part-spherical end portion is screwed into the second arm of the two-armed lever 123, the part-spherical portion engaging a hole in a lower end portion of an upwardly extending latch bar 129. The bar 129, the amount of movement of which is limited as hereinafter described, is operated by and also restricts the movement of the lever. By this means, when the stop member 61 is being moved from one position to the other, the rod 111 first slides into the trunnion block (the lever 123 being meanwhile held against clockwise rotation, as seen in Fig. 6, by connection to the bar 129), the spring 121 yielding until the two members of the toggle 111, 61 are in line. With further movement of the stop member this toggle breaks in the opposite direction and allows the spring to take control and drive the stop member into and hold it in the other position. Thus, one of each of the two pairs of rolls is moved out of engagement with the rods 41 and 97, and the other rolls are moved into engagement with the rods.

For the purpose of swinging the stop member 61 alternateiy from one position to the other, the member has mounted thereon rolls 131 and 133 which are alternately engaged by push-rods 135 and 137, respectively, which are mounted for horizontal sliding movement in the frame 7. Roll 131 is freely mounted on the aforesaid pin 115 between the arms of the bifurcated head 113, while the roll 133 is freely mounted on a second pin 139 carried by the ribs 117 and is of sufficient width substantially to prevent axial movement of the roll between the ribs.

The bar 129 (Figs. 5 and 6) is mounted for vertical sliding movement between a face 141 of a flange 143 provided on the support 65 and a face 145 of the frame 7, the bar having a rectangular opening 147 (Fig. 7) therein through which a shoulder 149 of the support 65 extends. The portion of the bar surrounding the opening 147 freely slides vertically between the faces 141 and 145; and the extent of this sliding movement of the bar is determined by the heightwise length of the opening 147. The support 65 has a reduced shank 151 (Figs. 5 and 6) whereby it is fixed in the frame 7, the shoulder 149 being drawn tightly against the face 145 by means of ascrew 153 and being keyed against rotary movement by the engagement of a pin 157, fixed in the shank 151, with a groove 159 in the frame 7. The bar 129 is provided with a D-shaped opening 160 (Fig. 7) having its straight side uppermost, just beneath the rectangular opening 147 for the passage therethrough of the end portion of the push rod 135 which is cut away on its upper side to provide a stop face 161. The position of the D-shaped opening is such that when the bar 129 is in its lowest position, determined by the upper side of the opening 147 resting on the shoulder 149 of the sup- .5 Port he po t on of. t e be: a ong, th fl s d of e ushered openi jus dea o the ha zsntaj ce of the push rod 135. The portion of'the bar 129 between h op ng 1 7. 16 h n lies i th Pa h f th s p face 161 to prevent movement of the push rod 135 to the right as shown in Fig, 5. The upper push rod 137 is similarly cut away on its under side to provide a stop face 163. The bar 129 is so arranged that when it is in its highest position, determined by the lower edge of the opening 147 coming into contact with the under side of the shoulder 149 of the support 65,v the upper end of the bar is just clear of the horizontal face of the push rod 137, as shown in Fig. 6, but lies within the pathof the stop face 163 and prevents movement of the push rod 137 to the right.

The push rod 135, 137 are provided at their left hand ends wtih oppositely disposed heads 165, 167 (Fig. 5) each slotted to engage rolls 169, 171 freely mounted on pins 173, 175 carried by bifurcated arms of a whiflietree 177 which straddles the heads 165, 167. The whifiletree is in turn straddled by a bifurcated arm of a bell crank lever 1791 which arm supports in its end portions 2. pin 18 1 on'which the whifiletiree is pivoted at its center. The bell crank lever is pivoted on a pin 183 carried by the frame 7 and is urged in an anticlockwise direction about its pivot by a torsion spring 185. The other arm of the bell crank lever extends to the right and is pivotally connected to a treadle rod 187 which extends downwardly and is pivotally connected at its lower end to a treadle (not shown).

If the treadle is depressed when the stop member 61 is in the position shown in Fig. 5, the bell crank lever 179 is moved in a clockwise direction about its pivot 183, thus moving the pivot 181 of the whiiiletree 177 to the right. Owing to the position of the latch bar 1 29 (i. e. its downward position) the lower push rod 135 is prevented from moving to the right and consequently the lower end of the whifiietree is prevented from moving. However, the bar 129 is now below the path of the stop face 163 on the push rod 137' and the roll 171 upon the upper end of the whiilietree thrusts the push rod to the right, swinging the stop member 61 in a clockwise direction out of its setting illustrated in Fig. 5 against the force of the spring 121. As soon as the pin 115 passes its dead center position between the pin 63 and the trunnion block 119 the spring 121, which up to this time has been increasingly compressed and energized, completes the clockwise movement of the stop member into its other setting, as illustrated in Fig. 6, in which the stop member is now held by the force of the spring with the lower shoulder 66 of the stop member in engagement with the end of the frame 7.

With the stop member 61 in the setting illustrated in Fig. 5 the force of the spring 121 is exerted through the trunnion block 119 upon the lever 12:3 inv a direction to the left of its fulcrum, the pin 125. The. bar 129 is thus held in its lowermost position, locking the push rod- 135 against movement to the right, While the push rod 137 is being operated to swing the stop member out of its setting illustrated in Fig. 5. After the stop member passes its mid position, however, and the force of the spring 121 becomes directed to the right of the pin 125,, the toggle 111, 123 breaks toward the right and thereby elevates the bar 129 into locking engagement with the push rod 137 and out of engagement with the push rod 135. With the stop member 61 now in the setting illustrated in Fig. 6 and held therein by the spring 121, the latch bar 129 has been set so. that upon the succeeding depression of the treadle the push rod 135 will be operated to return the stop member to its other setting as illustrated in Fig. 5.

Thus, on successive depressions of the treadle the presser is moved alternately from one operative position to another without the assistance of any power operated mechanism and without requiring the operator to keep 6 the treadle depressed to maintain the presser in either of its operative positions.

The use and operation of the illustrated now be summarized.

The position of the presser 1 toward and away from the feed roll 3 is varied, to change the depth. of cut of the knife 5 and hence the thickness of the skived por tion of the work, by turning the sleeves 71, 73 so as to adjust the abutment rolls 45, 47 appropriately for each setting of the stop member 61. It is evident that the rolls may be adjusted into the same positions, relatively to the pin 63, if the depth of cut of the knife is to be the same for both operative positions of the presser 1 and that each of the rolls can be adjusted, independently of the other, into any position within its range of adjustment different. from the position of the other roll if the thickness of the skived work is to be varied by changing the setting of the stop member. Similarly, the angular position of the presser 1 may be varied to control the angle of the skiving cut by turning the sleeves 107, 109 for positioning the abutment rolls 99, 101. Accordingly, a skiving cut of any desired depth orangle as determined by the adjustment of one pair of abutment rolls, such as rolls 45, 99, can be changed immediately by moving the stop member 61 to its other setting, inwhich the other pair of rolls 47, 101 are brought into use simultaneously to locate the presser in its other operative position.

The presser 1 is yieldingly held in each of its operative positions because the spring 121 biases the stop member 61 into each of its settings. Upon each depression of the treadle the stop member is moved away from one setting against the force of the spring 121 toward the other setting, that one of the push rods 137 which is not to be used being locked against movement by the bar 129. Immediately after the stop member has passed through its dead center position, the spring 121 drives the stop member into and holds it in the succeeding setting, without requiring any attention or assistance from the operator.

During the latter part of each shifting movement of the stop member, when the direction of the force exerted by the spring 121 upon the trunnion block 119 passes across the axis of the pin 125, the lever 123 is abruptly swung to cause the bar 129 to be moved into looking engagement with that one of the push rods 135, 137 which was last operated and out of engagement with the other of the push rods which was locked against movement during the shifting movement of the stop member just completed.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

l. A skiving machine having in combination a knife, a feed roll, a presser for controlling the skiving cut made upon a work piece presented to said knife, a carrier for said presser upon which said presser is mounted to swing to vary the angle of the skiving out, said carrier being mounted for movement toward and away from said knife to vary the depth of the skiving cut, mechanism for posi tioning said presser both angularly and toward and away from said. knife simultaneously'in either of two operative positions comprising. two pairs of abutments one for effecting each of said adjustments of said presser, connections. between each of said pairs of abut-ments and said presser and having common thereto a stop member carrying said abutments, saidmember being mounted for movement between two predetermined settings, and means for moving said stop member into its said settings alternately to bring one abutment of both pairs thereof and then the other abutments into operative relation to said connections in alternation.

2. A skiving machine having in combination a knife, a feed roll, a presser for controlling the skiving cutmade upon a work piece presented to said knife, a carrier for machine will said presser upon which said presser is mounted to swing to vary the angle of the skiving cut, said carrier being mounted to slide toward and away from said knife to vary the depth of the skiving cut, mechanism for swinging said presser from one operative position to another comprising a pair of abutments and a set of connections between said pair of abutments and said presser, mechanism for shifting said carrier toward and away from said knife from one operative position to another comprising a second pair of abutments and a second set of connections between said last mentioned abutments and said carrier, said mechanisms also having common thereto a stop member upon which both pairs of said abutments are mounted, said stop member being mounted to swing between two settings in each of which one abutment of both pairs thereof cooperates with said connections to position said presser both angularly and toward and away from said knife simultaneously in one of its operative positions.

3. A skiving machine having in combination, a knife, a feed roll, a presser having different operative positions, and mechanism for moving said presser between and holding it in any one of its said positions comprising a stop member having abutments mounted thereon for adjustment into settings corresponding to the desired operative positions of said presser, connections between said presser and stop member, and means for moving said stop member between two predetermined settings in each of which one of the said abutments cooperates with said connections to determine the operative position of said presser.

4. A skiving machine having in combination, a knife, a feed roll, a presser having different operative positions, and mechanism for moving said presser between and holding it in any one of said positions comprising a stop member having abutments mounted thereon for adjustment in accordance with the desired operative positions of said presser, connections between said presser and stop member, said stop member being mounted to swing between predetermined settings to bring said abutments selectively into cooperative relation with said connections, and operator controlled means for moving said stop member between its said settings.

5. A skiving machine having in combination, a knife,

a feed roll, a presser movable between difierent operative positions, and mechanism for shifting said presser from one operative position to the other comprising a stop member movable between two predetermined settings, operator controlled means for imparting an initial movement to said stop member out of each setting, and means acting upon said stop member to complete its movement into the succeeding setting.

6. A skiving machine having in combination, a knife, a feed roll, a presser having difierent operative positions and mechanism for shifting said presser between its said positions comprising a stop member mounted for movement between two settings, said member comprising adjustable abutments one of which is utilized in each setting of said member to determine the position of said presser, operator controlled means for moving said stop member between its settings, and means for holding said stop member in each of its settings.

7. A skiving machine having in combination, a knife, a feed roll, a presser mounted for movement between different operative positions, means for shifting said presser from each of its operative positions to the other comprising a stop member mounted for movement between two settings, said member carrying abutments one of which is utilized in each setting of said member to determine the position of said presser, operator controlled means movable in one direction during successive cycles of operation thereof for moving said stop member alternately in opposite directions between its said set- 1 tings, and means for yieldingly holding said stop member in each of its settings.

8. A skiving machine having in combination, a knife, a feed roll, a presser having different operative positions, and mechanism for moving said presser between and holding it in any one of said positions comprising a stop member having abutments mounted thereon for adjustment in accordance with the desired operative positions of said presser, connections between said presser and stop member, said stop member being mounted to swing between predetermined settings to bring said abutments selectively into cooperative relation with said connections, and operator controlled means operable in one direction in successive cycles of operation thereof to move said stop member alternately in opposite directions from each of its said settings toward the other.

9. A skiving machine having, in combination, a knife, a feed roll, a presser having different operative positions, and mechanism for shifting said presser from one operative position to the other comprising a stop member mounted for movement between two settings, said member comprising abutments one of which is utilized in each setting of said member to determine the position of said presser, operator controlled means operable in one direction in successive cycles of operation thereof to move said stop member alternately in opposite directions out of each setting toward the other, and means for driving said stop member into and holding it in the other setting.

10. A skiving machine having in combination, a knife, a feed roll, a presser movable between different operative positions, and mechanism for shifting said presser from one operative position to the other comprising a stop member movable between two predetermined settings each setting corresponding to an operative position of said presser, operator controlled means for moving said stop member away from each setting toward the other setting, and means energized by the initial movement of said stop member away from each setting for imparting to said stop member its final movement into the other setting.

11. A skiving machine having in combination, a knife, a feed roll, a presser movable between different operative positions, and mechanism for shifting said presser from one operative position to the other comprising a stop member movable between two predetermined settings, operator controlled means for moving said stop member out of each setting toward the other, and means for driving said stop member into and holding it in the other setting.

12. A skiving machine having in combination, a knife, a feed roll, a presser having different operative positions, and mechanism for shifting said presser from one operative position to the other comprising a stop member mounted for movement between two settings, each setting corresponding to an operative position of said presser, operator controlled means for shifting said stop member back and forth between two settings, and means acting in different directions successively upon said stop member during each shifting movement thereof to resist movement of said member out of its initial setting and then to drive said member into its final setting.

13. A skiving machine having in combination, a knife, a feed roll, a presser mounted for movement between different operative positions, mechanism for shifting said presser between its operative positions comprising an operating member and a stop member mounted to rotate between different settings corresponding to the operative positions of said presser, said stop member having abutments one of which cooperates with said operating member for each position of said stop member, operator controlled means for shifting said stop member between its settings comprising pnsh rods mounted for movement one at each side of the axis of rotation of said stop member into engagement therewith, a latch for preventing movement of said push rods toward said stop member, and means for moving said latch in opposite directions into operative relation with said push rods alternately as said stop member is moved into successive settings.

14. A skiving machine having in combination, a knife, a feed roll, a presser which is mounted for movement between diiferent operative positions, mechanism for moving said presser between its said positions comprising an operating member and a stop member, said stop member being mounted for movement between predetermined settings and having adjustable abutments one of which cooperates with said operating member for each setting of said stop member to position said presser in one of its operating positions, operator controlled means for shifting said stop member between its settings comprising a pair of pushers acting upon said stop member to move it in opposite directions, a latch cooperating with said pushers to lock either one against movement and to release the other, and means operated by successive movements of said stop member for moving said latch into locking engagement with said pushers, one at a time, alternately.

15. A skiving machine having, in combination, a knife, a feed roll, a presser mounted for movement between different operative positions, mechanism for shifting said presser between and holding it in any one of said positions comprising a stop member mounted for movement between two settings corresponding to the operative positions of said presser, operator controlled means for shifting said stop member from each of its settings to the other comprising pushers acting upon said stop member to move it in opposite directions, locking means engageable selectively with said pushers to prevent them from driving said stop member, and means operated in response to successive movements of said stop member for engaging said locking means with said pushers alternately.

16. A skiving machine having in combination, a knife, a feed roll, a presser movable between different operative positions and mechanism for shifting said presser from one operative position to the other comprising a stop member movable between two predetermined set- 10 tings, each setting corresponding to an operative position of said presser, operator controlled means for shifting said stop member comprising push rods acting upon said stop member to move it in opposite directions from each of its settings to the other, a latch mounted for movement into engagement with said push rods selectively to prevent one of them from driving said stop member, and connections driven by said stop member for operating said latch comprising a lever engaging said latch and a link pivoted upon said stop member and swivelled upon said lever, said link being arranged to act upon said lever alternately at opposite sides of its fulcrum during each shifting movement of said stop member between its said settings.

17. A skiving machine having in combination, a knife, :1 feed roll, a presser, and mechanism for shifting said presser from one operative position to another comprising a stop member movable between two settings, means for shifting said stop member from each of its settings to the other comprising a pair of push rods, a latch mounted for movement into locking engagement selectively with said push rods to lock either one against move ment and to release the other, a lever for operating said latch, a yielding link connected to said stop member and said lever, said link constituting with said stop member one toggle which passes through its dead center position during each shifting movement of said stop member whereby said stop member is biased into each of its settings, said link also constituting with said lever a second toggle which is driven through its dead center position in response to movement of the first-mentioned toggle through its dead center position whereby said lever is operated to move said latch out of locking engagement with one push rod into locking engagement with the other push rod.

No references cited. 

